66 lines
2.4 KiB
Java
66 lines
2.4 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.nebula.web.common.utils;
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import com.nebula.base.utils.DataUtils;
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import java.lang.reflect.Method;
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import java.util.Objects;
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import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
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import org.springframework.expression.ExpressionParser;
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import org.springframework.expression.spel.standard.SpelExpressionParser;
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import org.springframework.expression.spel.support.StandardEvaluationContext;
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/**
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* @author : wh
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* @date : 2024/3/16 10:20
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* @description:
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*/
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public class ExpressionUtil {
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/**
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* el表达式解析
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*
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* @param expressionString 解析值
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* @param method 方法
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* @param args 参数
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* @return
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*/
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public static Object parse(String expressionString, Method method, Object[] args) {
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if (DataUtils.isEmpty(expressionString)) {
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return null;
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}
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// 获取被拦截方法参数名列表
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LocalVariableTableParameterNameDiscoverer discoverer = new LocalVariableTableParameterNameDiscoverer();
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String[] paramNameArr = discoverer.getParameterNames(method);
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// SPEL解析
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ExpressionParser parser = new SpelExpressionParser();
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StandardEvaluationContext context = new StandardEvaluationContext();
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for (int i = 0; i < Objects.requireNonNull(paramNameArr).length; i++) {
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context.setVariable(paramNameArr[i], args[i]);
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}
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return parser.parseExpression(expressionString).getValue(context);
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}
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public static boolean isEl(String param) {
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if (DataUtils.isEmpty(param)) {
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return false;
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}
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return Objects.equals(param.substring(0, 1), "#");
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}
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}
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